Home / 1,553.70-2,142.63-1,021.65

Finding the Fourth Proportional to 1,553.70, 2,142.63 and 1,021.65

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Solution

The fourth proportional to 1,553.70, 2,142.63 and 1,021.65 is: 1,408.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.70 : 2,142.63 = 1,021.65 : x
  2. Step 2: Convert to fraction form
    1,553.70/2,142.63 = 1,021.65/x
  3. Step 3: Cross multiply
    1,553.70x = 2,142.63 × 1,021.65
  4. Step 4: Simplify right side
    1,553.70x = 2,189,017.94
  5. Step 5: Solve for x
    x = 2,189,017.94/1,553.70
  6. Step 6: Final answer
    x = 1,408.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.